3.1.1 Differential current tripping/warning
The pickup characteristics are defined using customisable curves.
100%
200%
300%
400%
500%
Trip at fixed value 100%
Trip at fixed value 85%
Upper limit
Lower limit
Trip Y1T
Warn. Y1W
Trip Y2T
Warn. Y2W
SP-X1
0%
50%
100%
Adju
stabl
e wa
rning
curv
e
Adj
usta
ble
trip
cur
ve
Id
In
Is
In
The trip/warning pickup characteristics are shown above. They are a function of:
●
Stabilisation current Is in relation to nominal current In (X-axis)
●
Differential current Id in relation to nominal current In (Y-axis)
The lines marked "UPPER LIMIT" and "LOWER LIMIT" are the limits for the curves.
Max. values are:
●
X1: 500 %
●
Y1: 45 %
●
Y2: 95 %
Min. values are:
●
X1: 50 %
●
Y1: 5 %
●
Y2: 25 %
There are two sets of adjustable settings:
●
Warning, set points Y1W and Y2W (can be disabled)
●
Trip, set points SP-X1, Y1T and Y2T
The warning curve shares the SP-X1 value with the trip curve.
Both settings are with adjustable time delay (0.01 to 2.00 sec.)
3.2 Display
Front-mounted display with push-buttons and display of all measured values and alarms.
The following values can be read:
MDR-2 DRH 4189340300 UK
Standard functions
DEIF A/S
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